CN111547924A - Method and device for refining brine by air floatation method - Google Patents
Method and device for refining brine by air floatation method Download PDFInfo
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- CN111547924A CN111547924A CN202010533986.4A CN202010533986A CN111547924A CN 111547924 A CN111547924 A CN 111547924A CN 202010533986 A CN202010533986 A CN 202010533986A CN 111547924 A CN111547924 A CN 111547924A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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Abstract
The invention belongs to the technical field of brine purification, and particularly relates to a method and a device for refining brine by an air floatation method. The method applies the air flotation technology to the refined brine, which not only can improve the production efficiency of salt-making and salt-chemical enterprises and reduce the cost of salt products, but also can improve the quality of the salt products, thereby widening the application field of the salt products limited by the product quality and laying a foundation for the application of the air flotation technology in the brine purification field. The brine refining device by the air floatation method can separate insoluble substances in water as small as 0.05 micron, and has good separation effect when being used for refining brine.
Description
Technical Field
The invention relates to the technical field of brine purification, in particular to a method and a device for refining brine by an air floatation method.
Background
At present, brine purification refining production processes generally have different brine purification modes and means according to different brine components, and the conventional purification modes and means mainly comprise the following steps: one is prepared by adding chemical agent, flocculant and Ca in bittern2+、Mg2+After the ionic impurities react, large-particle solids such as mud, sand and other insoluble solid impurities are removed through a settling pond or a settler; one method is that no chemical agent is added, large-particle solid such as mud and sand is removed by a sedimentation tank or a settler, and then brine containing suspended solid and high in turbidity is led into a sand filter or other filtering equipment, so as to achieve the purpose of reducing water turbidity or purifying water quality and removing impurities; and the other method is to utilize the membrane technology to achieve the purposes of impurity removal and purification and turbidity reduction on the basis of the two brine purification methods, for example, the brine for medical production in some enterprises adopts a treatment mode combining chemical agent reaction sedimentation impurity removal and the membrane technology.
However, the sand filtration device has low removal rate of grease and colloid, has poor decolorization effect, and requires that the concentration of treated water inlet suspended matters cannot be too high, otherwise, the loss of fittings and water distributors in the device is too large; the sand filtration devices are generally connected in series to work in groups, the occupied area is large, a backwashing working mode is adopted due to the structural requirements of the sand filtration devices, the backwashing water is frequently consumed in the flushing operation, and the used filtration media need to be supplemented every year. Other filtering equipment such as bag filter, precision filter etc. generally have certain requirement to the quality of water solid impurity of intaking, and the reduction effect to brine turbidity after filtering is not obvious. The use of the membrane technology has higher requirements on brine entering the membrane, saturated brine can enter the membrane to further refine the brine after oil and impurity removal, and the application in the field of industrial salt and edible salt is less at present due to the consideration of higher investment, higher daily maintenance cost and the like. In addition, the saturated brine has low suspended matter content, the soluble colloid is difficult to remove, and the requirements on the selection of process parameters and the operation of technical operation are high. In order to solve the above problems, improve the saturated brine purification effect and reduce the brine purification treatment cost, a new brine purification technology is urgently needed.
Disclosure of Invention
The invention aims to provide a method and a device for refining brine by an air floatation method, which can improve the saturated brine purification effect and reduce the brine purification treatment cost.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for refining brine by an air floatation method, which comprises the following steps:
performing solid-liquid separation on raw material brine to obtain a primary clarified liquid;
mixing the preliminary clarified liquid with a flocculating agent, and performing flocculation reaction-air flotation purification to obtain clear liquid;
evaporating the clear liquid to obtain refined salt.
Preferably, the solid-liquid separation mode is sedimentation.
Preferably, the flocculant is a food-grade flocculant and comprises one or more of polyacrylamide, sodium polyacrylat, polymeric ferric sulfate, polymeric aluminum chloride and polymeric aluminum sulfate.
Preferably, the mixing time of the primary clarified liquid and the flocculating agent is 10-30 s, the temperature is 20-30 ℃, and the velocity gradient is 500-1000 s-1。
Preferably, in the flocculation reaction-air flotation purification process, the circulating water amount of the air flotation device is 20-60% of the treatment water amount, and the dissolved air pressure is 0.25-0.35 Mpa.
Preferably, the flocculation reaction-air flotation purification time is 15-30 min, and the velocity gradient is 10-100 s-1。
The invention provides a brine refining device by an air floatation method, which comprises a sedimentation unit 1, a medicine dissolving unit 2, an air floatation unit 3, an evaporation system 4, a remote automatic control system 5, a sludge storage tank 6 and a water pipeline 7, a first discharge port 1-1 of the sedimentation unit 1 is connected with a first connecting port 3-1-1 of the air flotation unit 3 through a water conveying pipeline 7, the medicine dissolving unit 2 is connected with a water delivery pipeline 7, a third discharge port 3-2-1 of the air floating unit 3 is connected with an evaporation system 4, the second discharge port 1-2 of the sedimentation unit 1 is connected with a sludge storage tank 6, the fourth discharge port 3-2-2 of the air flotation unit 3 is connected with the sludge storage tank 6, the remote automatic control system 5 is connected with a second connecting port 3-1-2 of the air floatation unit 3.
Preferably, the settling unit 1 is a settling tank or a settler.
Preferably, the air flotation unit 3 comprises a pressure dissolved air tank, an air compressor, a circulating pump, an air flotation tank and an air bubble generator, wherein an outlet of the air flotation tank is connected with an inlet of the circulating pump, an outlet of the circulating pump is connected with a first inlet of the pressure dissolved air tank, an outlet of the pressure dissolved air tank is connected with the air bubble generator, and an outlet of the air compressor is connected with a second inlet of the pressure dissolved air tank.
Preferably, the drug dissolving unit 2 contains a flocculating agent.
The invention provides a method for refining brine by an air floatation method, which comprises the following steps: performing solid-liquid separation on raw material brine to obtain a primary clarified liquid; mixing the preliminary clarified liquid with a flocculating agent, and performing flocculation reaction-air flotation purification to obtain clear liquid; evaporating the clear liquid to obtain refined salt.
The method applies the air flotation technology to the refined brine, which not only can improve the production efficiency of salt-making and salt-chemical enterprises and reduce the cost of salt products, but also can improve the quality of the salt products, thereby widening the application field of the salt products limited by the product quality and laying a foundation for the application of the air flotation technology in the brine purification field.
The invention provides a brine refining device by an air floatation method, which has the advantages that the used auxiliary equipment is less, the occupied area is small compared with other solid-liquid separation equipment, and the device can be installed on the ground and at a high place, so that the transportation and the installation are convenient;
the device disclosed by the invention has the advantages that the consumed power is extremely low (only 0.1-0.3 kw is needed for treating each part of brine), the maintenance cost is low, the manual operation is less, the manual guard is not needed in normal operation, the operation is simple, the utilization efficiency of the existing production equipment can be improved, the investment and operation energy consumption are low, and the purposes of energy conservation and emission reduction can be achieved;
the device used by the invention can realize automatic operation, and a remote operation and maintenance platform is built by virtue of the cloud system architecture, so that the automation degree is high.
The air floatation device used in the invention has a high removal rate of 95-99% for suspended solids in the clarified liquid, and can remove a large amount of substances such as fiber, grease and the like, thus having high benefit; the bubble generator used by the air floatation device can realize self-cleaning through pressure induction, prevent the bubble generator from being blocked by salt crystallization, and greatly improve the operation stability of equipment.
The device used in the invention instantly scrapes off waste residues generated in brine purification and refined salt production by the floating layer, is convenient to discharge, has small water body disturbance, and can reduce the volume of sludge by 50-80%.
In the device used by the invention, the drug dissolving process is completed in the water conveying pipeline for communicating the sedimentation unit and the air flotation unit, so that the drug dissolving equipment is reduced, and the investment cost is reduced;
the air floatation device used in the invention can continuously and stably release tiny 'bubble clouds' with the diameter of 30-50 microns, can separate insoluble substances in water as small as 0.05 micron, and is used for producing brine purification refined salt, and the separation effect is good.
Drawings
Fig. 1 is a schematic view of a brine refining device by an air floatation method, wherein 1-a settling unit, 2-a medicine dissolving unit, 3-an air flotation unit, 4-an evaporation system, 5-a remote automatic control system, 6-a sludge storage tank, 7-a water pipeline, 1-1 a first discharge port of the settling unit 1, 3-1-1 a first connection port of the air flotation unit 3, 3-2-1 a third discharge port of the air flotation unit 3, 1-2 a second discharge port of the settling unit 1, 3-2-2 a fourth discharge port of the air flotation unit 3, and 3-1-2 a second connection port of the air flotation unit 3 are shown in the figure.
Detailed Description
The invention provides a method for refining brine by an air floatation method, which comprises the following steps:
performing solid-liquid separation on raw material brine to obtain a primary clarified liquid;
mixing the preliminary clarified liquid with a flocculating agent, and performing flocculation reaction-air flotation purification to obtain clear liquid;
evaporating the clear liquid to obtain refined salt.
In the present invention, all the raw materials for preparation are brine or commercially available materials well known to those skilled in the art, unless otherwise specified.
The raw material brine is subjected to solid-liquid separation to obtain a preliminary clarified liquid. In the present invention, the raw brine preferably includes concentrated seawater, an aqueous solution mainly composed of sodium chloride prepared by dissolving halite ore or naturally formed. In the present invention, the solid-liquid separation is preferably performed by sedimentation, and the sedimentation is preferably performed in a sedimentation tank or a settler. The specific type of the settling pond or the settler is not particularly limited, and the settling pond or the settler with the type known in the art can be selected, and in the embodiment of the invention, the settling pond or the settler is specifically a dalton settler. In the process of sedimentation, heavy substances such as gravel in brine can quickly sink to the bottom of the settler or the sedimentation basin to be separated from the water body under the action of the gravity of the object, so that the effect of removing impurities such as heavy and easily-settled solid particles (such as mud, sand and other insoluble solid impurities) such as gravel in brine is achieved.
After the primary clarified liquid is obtained, the primary clarified liquid is mixed with a flocculating agent for flocculation reaction-air flotation purification to obtain clear liquid. In the invention, the flocculant is preferably a food-grade flocculant, and more preferably comprises one or more of polyacrylamide, sodium polyacrylat, polymeric ferric sulfate, polymeric aluminum chloride and polymeric aluminum sulfate; the adding amount of the flocculating agent is preferably 1-50 mg/mL, specifically, when the flocculating agent is polyaluminium chloride (PAC) and polyacrylamide, the adding amount of the polyaluminium chloride (PAC) is preferably 5-10 mg/L, and the adding amount of the Polyacrylamide (PAM) is preferably 1 mg/L; when the flocculating agent is polyferric sulfate and PAM, the dosage of the polyferric sulfate is preferably 50mg/L, and the dosage of the PAM is preferably 1 mg/L. In the invention, the mixing process is preferably to introduce the preliminary clarified liquid into an air flotation unit and then add a flocculating agent into a water pipeline connected to the air flotation unit.
In the invention, the air flotation unit preferably comprises a pressure dissolved air tank, an air compressor, a circulating pump, an air flotation tank and a bubble generator; the air floatation tank is preferably an ultramicro air floatation tank. In the invention, the principle of the air flotation is that the air flotation is adopted, compressed air is injected into an air dissolving tank to form saturated air dissolving brine (saturated air dissolving water is quickly formed within a few seconds), the saturated air dissolving brine is instantaneously decompressed through an air dissolving releasing system, saturated gas dissolved in brine is suddenly released to generate a large amount of micro bubbles, fine particles in brine are adhered, wrapped and supported through the micro bubbles, the specific gravity of the formed suspended matter mixture is slightly smaller than that of the brine, the suspended matter is brought to the water surface by the bubbles, and the skimmer is used for removing the suspended matter, so that the separation of solid particles or colloidal particles from the brine is realized.
In the invention, in the flocculation reaction-air flotation purification process, the treatment water amount of the air flotation device is preferably adjusted according to the inflow water flow, the circulating water amount of the air flotation device is preferably 20-60% of the treatment water amount, the dissolved air pressure is preferably 0.25-0.35 Mpa, and in the embodiment of the invention, the treatment water amount of the air flotation device is particularly 250-350 m3/h。
In the invention, the time for mixing the preliminary clarified liquid and the flocculating agent is preferably 10-30 s, more preferably 15-25 s, the temperature (the temperature of the preliminary clarified liquid) is preferably 20-30 ℃, more preferably 23-26 ℃, and the velocity gradient is preferably 500-1000 s-1More preferably 600 to 800s-1. In the invention, the time of the flocculation reaction-air floatation purification is preferably 15-30 min, more preferably 20-25 min, and the speed gradient is preferably 10-100 s-1More preferably 30 to 60 seconds-1. The invention separates and removes light suspended particles in water body, such as algae, animal and plant residues, fine colloidal impurities, short fibers and heavy metal ions through a flocculation reaction-air flotation purification process, and waste residue is instantly scraped off by a floating layer, so that the SS content of the effluent is reduced, and the turbidity is reduced.
In the flocculation reaction-air flotation purification process, a brine water body flows in a water conveying pipeline in a directional and irregular mode, simultaneously, an added flocculating agent is uniformly mixed with brine and reacts to break a stable colloid state in the brine water body, so that particulate matters (water-insoluble particles, colloids, suspended matters and the like) in the water body are gradually gathered to form large alum flowers, then the water body enters an air flotation device, a bubble generator continuously and stably releases micro 'bubble cloud clusters' with the diameter of 30-50 micrometers to be quickly adhered and wrap the particulate matters in the water body, and a small-density gas-liquid-solid three-phase mixed 'suspension' system formed by combination can quickly float upwards and separate from water, so that suspended particulate matters in saturated brine are separated and removed deeply and sludge with a minimum volume is generated.
After obtaining the clear liquid, the invention preferably evaporates the clear liquid to obtain the refined salt. In the present invention, the evaporation is preferably performed in an evaporation system, and the evaporation system and the evaporation process are not particularly limited in the present invention, and an evaporation system and a corresponding evaporation process well known in the art may be selected.
As shown in figure 1, the invention provides a brine refining device by an air floatation method, which comprises a sedimentation unit 1, a medicine dissolving unit 2, an air flotation unit 3, an evaporation system 4, a remote automatic control system 5, a sludge storage tank 6 and a water pipeline 7, a first discharge port 1-1 of the sedimentation unit 1 is connected with a first connecting port 3-1-1 of the air flotation unit 3 through a water conveying pipeline 7, the medicine dissolving unit 2 is connected with a water delivery pipeline 7, a third discharge port 3-2-1 of the air floating unit 3 is connected with an evaporation system 4, the second discharge port 1-2 of the sedimentation unit 1 is connected with a sludge storage tank 6, the fourth discharge port 3-2-2 of the air flotation unit 3 is connected with the sludge storage tank 6, the remote automatic control system 5 is connected with a second connecting port 3-1-2 of the air floatation unit 3.
In the present invention, unless otherwise specified, all structural elements required are structural elements known to those skilled in the art or disclosed in the prior art.
The brine refining device by the air floatation method comprises a sedimentation unit 1, wherein the sedimentation unit 1 is preferably a sedimentation tank or a settler, and is particularly preferably a dalton settler. According to the invention, raw brine is introduced into the sedimentation unit, heavy substances such as gravel in brine are sunk to the bottom of the sedimentation unit under the action of the gravity of an object and separated from a water body, so that the effect of removing impurities such as gravel is achieved, and the obtained impurities enter the sludge storage tank 6 through the second discharge port 1-2 of the sedimentation unit 1.
The brine refining device by the air floatation method comprises a medicine dissolving unit 2, wherein the medicine dissolving unit 2 is connected with a water pipeline 7. In the invention, the drug dissolving unit is preferably filled with a flocculating agent. In the invention, the brine water body treated by the settling unit enters a water conveying pipeline communicating the settling unit 1 and the air floating unit 3, the water body is in a directional irregular flow channel in the water conveying pipeline, the flocculant is injected into the water conveying pipeline by the pesticide dissolving unit, the flocculant and the brine are uniformly mixed and react to perform flocculating settling, the stable colloid state in the water body is broken, and the particulate matters (water-insoluble particles, colloids, suspended matters and the like) in the water body are promoted to be gradually aggregated to form larger alum flocs, and then the larger alum flocs enter the air floating unit 3.
The brine refining device by the air floatation method comprises an air floatation unit 3, wherein the air floatation unit preferably comprises a pressure dissolved air tank, an air compressor, a circulating pump, an air floatation tank and an air bubble generator, an outlet of the air floatation tank is connected with an inlet of the circulating pump, an outlet of the circulating pump is connected with a first inlet of the pressure dissolved air tank, an outlet of the pressure dissolved air tank is connected with the air bubble generator, and an outlet of the air compressor is connected with a second inlet of the pressure dissolved air tank; the first discharge port 1-1 of the sedimentation unit 1 is connected with the first connection port 3-1-1 of the air flotation unit 3 through a water conveying pipeline 7. In the present invention, the air flotation device used in the air flotation unit is preferably the device disclosed in the patent publication CN 209507926U. In the present invention, the bubble generator is made of a special non-metallic material (PVC resistant to salt water corrosion) which is resistant to corrosion. The traditional air-floating bubble generating device mostly adopts metal materials, the metal materials have lower uniform corrosion rate to neutral sodium chloride concentrated solution, seawater and brine at a certain temperature and concentration, but under special working conditions, such as dissolved oxygen in saturated brine, dangerous local corrosion can be generated in the bubble generating device. The bubble generator of the air floatation unit is made of corrosion-resistant special non-metallic materials, so that the operation stability and the maintenance cost of the equipment are greatly improved.
In the air flotation unit, a bubble generator continuously and stably releases tiny 'bubble cloud clusters' with the diameter of 30-50 microns to quickly adhere and wrap particulate matters in a water body, a small-density gas-liquid-solid three-phase mixed 'suspension' system formed by combination can quickly float upwards and is separated from water to perform air flotation purification, so that suspended particulate matters (suspended inorganic particles, algae, plant residues, fine colloidal impurities, short fibers and heavy metal ions) in saturated brine are separated and removed, sludge with a tiny volume is generated, waste residues are instantly scraped by a floating layer, and clear liquid is obtained. Wherein, the separated impurities obtained by the air flotation unit 3 enter a sludge storage tank 6 from a fourth discharge port 3-2-2 of the air flotation unit 3.
The brine refining device by the air floatation method comprises an evaporation system 4, wherein a third discharge hole 3-2-1 of an air floatation unit 3 is connected with the evaporation system 4. In the invention, clear liquid obtained from a third discharge port 3-2-1 of the air flotation unit 3 is sent to an evaporation system for evaporation to obtain refined salt.
The brine refining device by the air floatation method comprises a remote automatic control system 5, wherein the remote automatic control system 5 is connected with a second connecting port 3-1-2 of an air floatation unit 3. In the invention, the remote automatic control system 5 consists of a software control system and a control device; the remote automatic control system comprises a plurality of basic function modules such as equipment operation monitoring, fault alarm, work order management, video management and configuration. The invention realizes the automatic control of the air floatation unit by utilizing the remote automatic control system 5, and realizes energy conservation and emission reduction.
The brine refining device by the air floatation method comprises a sludge storage tank 6, wherein a second discharge port 1-2 of a sedimentation unit 1 is connected with the sludge storage tank 6, and a fourth discharge port 3-2-2 of an air floatation unit 3 is connected with the sludge storage tank 6.
The brine refining device by the air floatation method comprises a water pipeline 7, wherein the water pipeline 7 is used for connecting a first discharge port 1-1 of a sedimentation unit 1 with a first connecting port 3-1-1 of an air floatation unit 3.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In this embodiment, the amount of seawater concentrated brine treated by the air flotation device is 250m3The circulating water amount is 40 percent of the treated water amount, and the dissolved gas pressure is 030 Mpa.
After partial impurities of the raw material brine are removed, introducing a brine water body into a settling unit 1 (a dalton settler) for settling, performing solid-liquid separation to obtain a primary clarified liquid, and allowing the obtained impurities to enter a sludge storage tank 6 through a second discharge port 1-2 of the settling unit 1; introducing the primary clarified liquid into a first connector 3-1-1 of an air flotation unit 3 through a first discharge port 1-1 of the sedimentation unit 1, controlling the air flotation unit 3 through a remote automatic control system 5, controlling the temperature of brine at 30 ℃, adding a flocculating agent of a medicine dissolving unit 2 into a water pipeline communicating the sedimentation unit 1 and the air flotation unit 3 (the flocculating agent is PAM and PAC, the adding amount of PAC is 10mg/L, and the adding amount of PAM is 1mg/L), and controlling the speed gradient to be 600s-1Mixing was carried out under conditions of 20s and then at a velocity gradient of 50s-1Under the condition, carrying out flocculation reaction on the flocculating agent and the brine for 20min to form alumen ustum, entering an air flotation unit 3, carrying out air flotation purification to obtain clear liquid, and entering the obtained impurities into a sludge storage tank 6 through a fourth discharge port 3-2-2 of the air flotation unit 3; and (3) sending the clear liquid into an evaporation system 4 through a third discharge hole 3-2-1 of the air flotation unit 3 for evaporation to obtain refined salt.
Comparative example 1
The process described in example 1 was followed except that no flocculant was added.
Monitoring the processes of the example 1 and the comparative example 1, and finding that after the brine is primarily clarified, the inflow suspended matter is less than or equal to 50mg/L, and the inflow turbidity is less than or equal to 30 NTU;
under the condition of adding a flocculating agent (example 1), the turbidity of brine can be reduced to be below 5-10 NTU, SS is less than 10mg/L, the power consumption of each part of brine is only 0.1-0.3 kw, the whiteness of the obtained refined salt is more than 80, and the content of sodium chloride is more than or equal to 99.1%;
under the condition that a flocculating agent is not added (comparative example 1), after air floatation purification, the content of suspended solids, namely ss, is reduced to 10-15 mg/L, the turbidity is reduced to below 10-20 NTU, and the power consumption for treating each part of brine only needs 0.1-0.3 kw.
Example 2
The water treatment amount of the air floatation device for treating the well and mine brine is 350m3The circulating water amount is 45 percent of the treated water amount, and the dissolved air pressure is 0.30 Mpa.
After raw material brine is added with lime for reaction, introducing a brine water body into a settling unit 1 (a dalton settler) for settling, performing solid-liquid separation to obtain a primary clarified liquid, and allowing obtained impurities to enter a sludge storage tank 6 through a second discharge port 1-2 of the settling unit 1; introducing the preliminary clarified liquid into a first connecting port 3-1-1 of an air flotation unit 3 through a first discharge port 1-1 of the sedimentation unit 1, controlling the air flotation unit 3 through a remote automatic control system 5, controlling the water temperature to be 25 ℃, adding a flocculating agent of a medicine dissolving unit 2 into a water pipeline (the flocculating agent is polyferric sulfate (50mg/L) and PAM (1mg/L)) communicating the sedimentation unit 1 and the air flotation unit 3, and controlling the speed gradient to be 800s-1Mixing was carried out under conditions of 25s and then at a velocity gradient of 60s-1Under the condition, carrying out flocculation reaction on the flocculating agent and the brine for 25min to form alumen ustum, entering an air flotation unit 3, carrying out air flotation purification to obtain clear liquid, and entering the obtained impurities into a sludge storage tank 6 through a fourth discharge port 3-2-2 of the air flotation unit 3; and (3) sending the clear liquid into an evaporation system 4 through a third discharge hole 3-2-1 of the air flotation unit 3 for evaporation to obtain refined salt.
Monitoring the process of the example 2, and finding that after the brine is primarily clarified, the inflow suspended matters are less than or equal to 80mg/L, and the inflow turbidity is less than or equal to 100 NTU;
the SS content is reduced to less than or equal to 15mg/L, and the turbidity of brine can be reduced to less than 5 NTU.
From the above embodiments, the present invention provides a method and an apparatus for refining brine by air flotation process. The method applies the air flotation technology to the refined brine, which not only can improve the production efficiency of salt-making and salt-chemical enterprises and reduce the cost of salt products, but also can improve the quality of the salt products, thereby widening the application field of the salt products limited by the product quality and laying a foundation for the application of the air flotation technology in the brine purification field. The brine refining device by the air floatation method can separate insoluble substances in water as small as 0.05 micron, and has good separation effect when being used for refining brine.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for refining brine by an air floatation method is characterized by comprising the following steps:
performing solid-liquid separation on raw material brine to obtain a primary clarified liquid;
mixing the preliminary clarified liquid with a flocculating agent, and performing flocculation reaction-air flotation purification to obtain clear liquid;
evaporating the clear liquid to obtain refined salt.
2. The method of claim 1, wherein the solid-liquid separation is by sedimentation.
3. The method of claim 1, wherein the flocculant is a food grade flocculant comprising one or more of polyacrylamide, sodium polyacrylat, polymeric ferric sulfate, polymeric aluminum chloride, and polymeric aluminum sulfate.
4. The method according to claim 1, wherein the time for mixing the primary clarified liquid with the flocculating agent is 10-30 s, the temperature is 20-30 ℃, and the velocity gradient is 500-1000 s-1。
5. The method as claimed in claim 1, wherein in the flocculation reaction-air flotation purification process, the circulating water amount of the air flotation device is 20-60% of the treatment water amount, and the dissolved air pressure is 0.25-0.35 Mpa.
6. The method as claimed in claim 1 or 5, wherein the flocculation reaction-air flotation purification time is 15-30 min, and the velocity gradient is 10-100 s-1。
7. An air flotation brine refining device is characterized by comprising a settling unit (1), a medicine dissolving unit (2), an air flotation unit (3), an evaporation system (4), a remote automatic control system (5), a sludge storage tank (6) and a water conveying pipeline (7), wherein a first discharge port (1-1) of the settling unit (1) is connected with a first connection port (3-1-1) of the air flotation unit (3) through the water conveying pipeline (7), the medicine dissolving unit (2) is connected with the water conveying pipeline (7), a third discharge port (3-2-1) of the air flotation unit (3) is connected with the evaporation system (4), a second discharge port (1-2) of the settling unit (1) is connected with the sludge storage tank (6), and a fourth discharge port (3-2-2) of the air flotation unit (3) is connected with the sludge storage tank (6), the remote automatic control system (5) is connected with a second connecting port (3-1-2) of the air floatation unit (3).
8. The brine refining plant according to claim 7, wherein the settling unit (1) is a settling tank or a settler.
9. The brine refining device by the air flotation method according to claim 7, wherein the air flotation unit (3) comprises a pressure dissolved air tank, an air compressor, a circulating pump, an air flotation tank and an air bubble generator, wherein an outlet of the air flotation tank is connected with an inlet of the circulating pump, an outlet of the circulating pump is connected with a first inlet of the pressure dissolved air tank, an outlet of the pressure dissolved air tank is connected with the air bubble generator, and an outlet of the air compressor is connected with a second inlet of the pressure dissolved air tank.
10. The brine refining device by the air flotation method according to claim 7, wherein a flocculating agent is contained in the drug dissolving unit (2).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113501606A (en) * | 2021-06-25 | 2021-10-15 | 天津长芦汉沽盐场有限责任公司 | Saturated brine purification method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113501606A (en) * | 2021-06-25 | 2021-10-15 | 天津长芦汉沽盐场有限责任公司 | Saturated brine purification method |
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